default_url_options_bug.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $sdterr.puts "Bundler version 1.10 or later is required"
  raise  
end

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', '6.0.1'
end

require 'rack/test'
require 'action_controller/railtie'
require 'minitest/autorun'

class TestApp < Rails::Application
  config.root = File.dirname(__FILE__)
  config.session_store :cookie_store, key: 'cookie_store_key'
  secrets.secret_token = 'secret_token'
  secrets.secret_key_base = 'secret_key_base'

  config.logger = Logger.new($stdout)
  Rails.logger = config.logger

  routes.draw do
    root to: 'test#index'
  end
end

class TestController < ActionController::Base
  def default_url_options
    {
      host: 'www.example.com'
    }
  end

  def index
    render plain: 'success'
  end
end

# Comment in these lines to make tests pass.
# Rails.application.routes.default_url_options = {
#   host: 'www.example.com'
# }

class BugTest < Minitest::Test
  include Rack::Test::Methods

  def test_if_host_is_read
    assert_equal 'http://www.example.com/', Rails.application.routes.url_helpers.root_url
  end

  private

  def app
    Rails.Application
  end
end